Window screen



FIG. 1 is a front perspective view of the window screen;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a top plan view thereof with the bottom view being a mirror image thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a side elevational view as seen from the left hand side of FIG. 4 with the right hand side elevational view being a mirror image thereof; and,

FIG. 6 is a rear elevational view thereof.

The claimed design is broken in the views to indicate indeterminate width and length. 

The ornamental design for a window screen, as shown and described. 